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Seafloor Cavern is a subterranean cave deep beneath the waves of Route 128. The cavern is somewhat maze-like, and constantly requires the use of Rock Smash and Strength. In a misty cave, you'll discover TM26 (Earthquake). For more details on getting through the Seafloor Cavern check below.

Underwater Entrance[edit]

The cave in Route 128 with the submarine.
The entrance to Seafloor Cavern.

A cramped underwater area where you'll find the lost submarine that Team Aqua/Magma stole. Without much else to do use dive to surface.

Entrance and Entrance Room[edit]

Floor 1

Well, you made it, the Seafloor Cavern. Now all that's left it to go inside. Use rock smash on the left rock, then push the boulder down. You may then push the other boulder to the right. The Entrance Room has two Team Aqua/Magma Grunts and three doorways leading to the Entrance, Room 2, and Room 4 (southeast corner).

Trainers[edit]

Trainer
PRS&E Magma Grunt M.png
Team Magma Grunt
Trainer
PRS&E Magma Grunt M.png
Team Magma Grunt

Room 2[edit]

Floor 2

Accessed from the entrance's southeast exit.

The south east corner leads to room 6.

Pictured above, it is accessed by the northwest exit from the entrance.

The southwest exit leads to a junction where you may either exit the cave, or head to room 5.

Room 3[edit]

Floor 3

Both the middle and northwest lead to room 2. The northeast exit leads to Room 4 (southwest corner).

Room 4[edit]

Floor 4 in Ruby/Sapphire
Floor 4 in Emerald

The room is meant to be crossed diagonally.

The northwest exit leads to room 5, and the northeast exit leads to room 6.

Room 5[edit]

Floor 5

Room 6[edit]

Floor 6

Room 7[edit]

Floor 7 in Ruby/Sapphire
Floor 7 in Emerald
Trainer
'Magma Admin Courtney

Room 8[edit]

Floor 8

First, push the left and right boulders up. The middle boulder is pushed to the side. Push the next middle boulder up, the adjacent boulders to the side. In the last row, push the left and right boulders up, and the middle to the side.

Final Room[edit]

Floor 9 in Ruby
Floor 9 in Sapphire/Emerald

TM26 is found at the entrance.

When you reach the southern part of the map, you will see the legendary Pokémon waiting. Then, you will be attacked by the leader of the antagonist team.

Trainer
PRS&E Magma Leader Maxie.png
Magma Leader Maxie

After the battle, the orb will be used on the legendary to awaken and control it. However, the legendary will simply escape.

If you are playing Pokémon Ruby, the sunlight will become strong over Route 128, through Lilycove City.

Pokémon Found[edit]

Pokémon found (cave)
Ruby Encounter Rate Sapphire Encounter Rate Emerald Encounter Rate
Pokemon 041Zubat.pngZubat 90% Pokemon 041Zubat.pngZubat 90% Pokemon 041Zubat.pngZubat 90%
Pokemon 042Golbat.pngGolbat 10% Pokemon 042Golbat.pngGolbat 10% Pokemon 042Golbat.pngGolbat 10%
Pokémon found (Surfing)
Ruby Encounter Rate Sapphire Encounter Rate Emerald Encounter Rate
Pokemon 072Tentacool.pngTentacool 60% Pokemon 072Tentacool.pngTentacool 60% Pokemon 072Tentacool.pngTentacool 60%
Pokemon 041Zubat.pngZubat 35% Pokemon 041Zubat.pngZubat 35% Pokemon 041Zubat.pngZubat 35%
Pokemon 042Golbat.pngGolbat 5% Pokemon 042Golbat.pngGolbat 5% Pokemon 042Golbat.pngGolbat 5%
Pokémon found (Fishing)
Ruby Encounter Rate Sapphire Encounter Rate Emerald Encounter Rate
Old Rod
Pokemon 129Magikarp.pngMagikarp 70% Pokemon 129Magikarp.pngMagikarp 70% Pokemon 129Magikarp.pngMagikarp 70%
Pokemon 072Tentacool.pngTentacool 30% Pokemon 072Tentacool.pngTentacool 30% Pokemon 072Tentacool.pngTentacool 30%
Good Rod
Pokemon 129Magikarp.pngMagikarp 60% Pokemon 129Magikarp.pngMagikarp 60% Pokemon 129Magikarp.pngMagikarp 60%
Pokemon 072Tentacool.pngTentacool 20% Pokemon 072Tentacool.pngTentacool 20% Pokemon 072Tentacool.pngTentacool 20%
Pokemon 320Wailmer.pngWailmer 20% Pokemon 320Wailmer.pngWailmer 20% Pokemon 320Wailmer.pngWailmer 20%
Super Rod
Pokemon 320Wailmer.pngWailmer 100% Pokemon 320Wailmer.pngWailmer 100% Pokemon 320Wailmer.pngWailmer 100%